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This change should make chromium.fyi/linux-code-coverage-generation
build one target with code coverage instrumentation and isolate it using
the chromium recipe.

This depends on change http://crrev.com/c/1258608

Tested locally:

~/chromium/src/tools$ ./mb/mb.py lookup -m chromium.fyi -b \
linux-code-coverage-generation

Writing """\
is_clang = true
is_component_build = false
is_debug = false
strip_absolute_paths_from_debug_symbols = true
symbol_level = 0
use_clang_coverage = true
use_goma = true
""" to _path_/args.gn.

R=mmoroz,stgao,liaoyuke

Bug: chromium: 891532
Change-Id: I5afdd45d149fad0f62b8a6b8f021c99d0217134c
Reviewed-on: https://chromium-review.googlesource.com/c/1255590Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596514}